TABLE 1

Characteristics of Newborns in the Study Population

Newborn CharacteristicN%
Year of birth
 201024 36316.4
 201124 53016.5
 201224 77516.6
 201323 93116.1
 201425 18416.9
 201526 19817.6
Sex
 Girl73 40649.3
 Boy75 57550.7
Race or ethnic group
 American Indian or Alaskan native5390.4
 Asian or Pacific Islander38 59625.9
 Black or African American82965.6
 Hispanic (regardless of race)31 37821.1
 White58 71439.4
 Missing or other11 4587.7
Maternal Tdap vaccination during the 2 y before pregnancy
 No112 38575.4
 Yes36 59624.6
Maternal Tdap vaccination during pregnancy
 No79 29253.2
 1–7 d before birth15211.0
 8+ days before birth68 16845.8
Maternal Tdap vaccination during the 1 y after birtha
 No122 96282.5
 0–14 d on or after birth21 26814.3
 15 d to 1 y after birth47513.2
  • a Maternal Tdap vaccination after pregnancy is analyzed as a time-varying covariate.